Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 665-2-M PL3351 found under Valve Check by Cpv Manufacturing Inc. The National Stock Number assigned to this part is 4820010324653, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 665-2-M PL3351.